m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 55

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 2.3.5. Operation timing of transmission in clock-synchronous serial I/O mode
Example of wiring
Example of operation
Transfer clock
Transmit
enable bit (TE)
Transmit
buffer empty
flag (Tl)
CTSi
CLKi
TxDi
Transmit register
empty flag
(TXEPT)
Transmit
interrupt request
bit (IR)
Shown in ( ) are bit symbols.
The above timing applies to the following settings:
• Internal clock is selected.
• CTS function is selected.
• CLK polarity select bit = “0”.
• Transmit interrupt cause select bit = “0”.
“H”
“1”
“0”
“1”
“0”
“L”
“1”
“0”
“1”
“0”
(1) Transmission enabled
page 46 of 354
(2) Confirming CTS
Data is set to UARTi transmit buffer register
(3) Start transmission Tc
D
0
D
1
Microcomputer
D
T
2
CLK
D
3
Transferred from UARTi transmit buffer register to UARTi transmit register
D
4
Note : Since T
D
CTSi
CLKi
T
5
X
Di
D
6
Cleared to “0” when interrupt request is accepted, or cleared by software
this pin needs pull-up resistance.
(4) Transmission is complete
D
7
Stopped pulsing because CTSi = “H”
(5) Transmit next data
X
D
D
0
2
D
pin is N-channel open drain,
1
Tc = T
(Note)
D
2
fi: frequency of BRGi count source (f
n: value set to BRGi
D
CLK
3
D
= 2(n + 1) / fi
4
D
5
Receiver side IC
D
6
CLK
R
Port
D
X
D
7
Stopped pulsing because
transfer enable bit = “0”
2. Clock-Synchronous Serial I/O
D
0
D
1
1
D
, f
2
8
, f
D
3
32
)
D
4
D
5
D
6
D
7